Cellphones.Are they really necessary?

In reality its not really necessary for all. Its a luxury for me to have a mobile phone. Looking back, people before have lived and survived without mobile phones and other high technology gadgets we have now in our time. When i haven't had a cellphone of my own, i was pervently asking my mom to buy me one. Back then, i only borrowed hers if i want to send an SMS to someone. Then came a time, i was able to buy one for my self, i enjoyed it for 2 years. I bring it wherever i go, even in my sleep its just by my side. Now, i guess i have outgrown it, i do not even charge the batery for days and just let my phone in the shelve or lent it to my sister or cousin. They like my phone so much, its a sony ericsson camera phone. But i don't need it now, most of the time i am just at home. There is a telephone if someone wants to reach me. Yes, it has some advert effects, just like in typing, frequent pressing or typing in cellphone is not good to the fingers and the radioactivity it has is bad for our body.